Add missing file to artifacts.zip and win platform. (#39310)

dll.exp, dll.lib and dll.pdb files are missing from the gn generated
artifacts.zip.

Bug: https://github.com/flutter/flutter/issues/119663

build/archives/BUILD.gn

diff --git a/build/archives/BUILD.gn b/build/archives/BUILD.gn
index 023cafd..0d0fd4f 100644
--- a/build/archives/BUILD.gn
+++ b/build/archives/BUILD.gn
@@ -258,6 +258,18 @@
         source = "$root_out_dir/flutter_windows.dll"
         destination = "flutter_windows.dll"
       },
+      {
+        source = "$root_out_dir/flutter_windows.dll.exp"
+        destination = "flutter_windows.dll.exp"
+      },
+      {
+        source = "$root_out_dir/flutter_windows.dll.lib"
+        destination = "flutter_windows.dll.lib"
+      },
+      {
+        source = "$root_out_dir/flutter_windows.dll.pdb"
+        destination = "flutter_windows.dll.pdb"
+      },
     ]
   }
 }